Wrench.



PATENTED SEPT. 5, 1905.

W. PRAZER.

WRENCH.

APPLICATION. funn 23.7.1905

iii

UNTTED STATES PATENT FFTCE.

WRENCH.

Specification of Letters Patent.

Patented Sept. 5, 1905.

Application am pril 7, 1905. semi No. 254,291.

To rr/ZZ 'uhh/m1, it muy concern:

Be it known that I W'ILLIAM Fi-mznu. a ei ti- Zen of the United Statesof America, residing at Sherrctt, in the county of Armstrongl and Stateof Pennsylvania, have invented certain new and useful Improvements inlVrcnches, of which the following is a specification, reference beinghad therein to the accompanying drawings.

This invention relates to certain new and useful improvements inwrenches, and more particularly to that type of wrench commonly known asa monkey-wrench.

This invention has for its object to provide a novel form of wrench thatcan be easily and quickly adjusted to grip objects of various sizes.

Another object of this invention is to provide a wrench which will beextremely simple in construction, strong and durable, comparativelyinexpensive to manufacture, and highly etiicient for the purposes forwhich it is to be used.

1Vith the above and other objects in view the invention consists in thenovel construction, combination, and arrangement of parts, which will behereinafter more fully described and then specifically pointed out inthe claims, and, referring to the drawings accompanying' thisapplication, like numerals of reference designate corresponding partsthroughout the several views, in which- Figure 1 is a side elevation ofmy improved wrench. Fig. 2 is a rear edge view of the same. Fig. 3 is avfront view of the wrench. Fig. a is a vertical sectional view of thewrench, partly in side elevation.Y Fig. 5 is a perspective view of amovable jaw used in connection with my improved wrench. Fig. 6 is aperspective view of one end of the shank of my improved wrench. Fig. 7is a perspective view of a modified Vform of movable jaw that may beemployed in connection with my improved wrench. Fig. 8 is a perspectiveview of a locking member, and Fig. 9 is a transverse sectional viewtaken on the line .r n: of Fig. 4.

.ln the accompanying drawings the reference-numeral 1 designates a shankcarrying a suitable handle 2. The upper end of the shank 'l isbifurcated to form transverse walls 3 Carried by the edges of said sid ewal ls is a strap 4f, which is preferablyformed integral with saidwalls. ln the strap a is pivotally mounted by a pin a member 6, one sideof which is bcveled, as indicated at 7, and serrated, as indlcated at 8.The rear wall of the strap 4 is beveled or tapered, as indicated at 9,and is provided with a vertically-disposed slot 10, through whichprotrudes a headed pin 11, carried by the upper end of the member 6. Tothe front face of the strap 4 is secured, as indicated at 12, a spring14, adapted to bear against the front or plane surface of the member 6.

1n the strap 4; is adapted to be mounted an auxiliary shank 15, which isserrated upon its Vfront edge, as indicated at 16. The auxiliary shankcarries a fixed head or jaw 17, and upon the shank 15 is mounted amovable jaw 18. This jaw is provided with a vertically-disposed aperture19, adapted to receive the shank 15, and the lower edge of the jaw iscut away, forming al curved surface, as indicated at 20. The jaw 18 isprovided with a depending lug 21, having an aperture Q2 formed therein.Then the jaw 18 is mounted upon the auxiliary shank 15 andthe shank A15is placed within the strap et. the depending lug 21 is adapted to restbetween the walls 3 3 of the main shank 1, and said lug is retainedtherein by a pin Q3, extending through thev substantially segment-shapcdslots 9.45, formed in the walls 3 3 and the aperture 22 of the lug 21.

The operation of my improved wrench is as follows: dien it is desired toadjust the movable jaw 18 of the wrench, the pin 11 is pressed, whichwill cause the serrated portion of the member 6 to move out ofengagement with the serrated edge 16 of the auxiliary shank 15, at whichtime the movable jaw 18 and the shank 1 can be adjusted upon theauxiliary shank 15. \Vhen the movable jaw has been so adjusted and thepin 11 released, the spring 11 returns the member 6 to its normalposition in engagement with the serrated cdge 16 of the auxiliary shank15, and the shanks 1 and 15 will be locked in engagement with oneanother. After the movable jaw 18 has been moved into as close proximityto the object as possible a still further engagement of the movable jawwith the object is accomplished by moving the shank 1 outwardly Afromthe auxiliary shank 15, the curved edges 25 25 of the walls 3 engagingthe curved surface Q0 of the movable jaw and movingI it into 'furtherengagement with the object beinggripped. This movement is permittedthrough the movement of the beveled or tapering face 9 of the strap L1and the slot 10 of said strap, the spring 14 at all times re- IooV IIO

taining the member 6 in engagement with the auxiliary shank 15 duringthis minute adjustment.

In Fig. 7 of the drawings I have illustrated a movable jaw that may beused in lieu of the jaw 18 previously described, the only differencebeing that I provide the grippingsurface of said jaw with a serratedconcavity or recess 26, and this jaw is preferably employed when it isdesired to use my improved wrench for gripping curved surfaces and sucharticles as pipes and rods.

A wrench constructed in accordance with my invention can be easily andquickly manipulated and a positive and effectual gripping of an objectaccomplished. I have entirely dispensed with the use of screw-th reads,commonly employed in connection with wrenches, and have employed aconstruction not readily injured by rough handling or apt to break whenconsiderable leverage is used in connection with the rotation of anobject or article by my improved Wrench.

Vhile I have herein shown and described the preferred manner ofconstructing my improved wrench, it is obvious that various changes maybe made in the details of construction without departing from thegeneral spirit and scope of the invention.

What I claim, and desire to secure by Letters Patent, is;

l. In a wrench of the character described, the combination with a shankhaving a handle and a bifurcated upper end, of a strap carried by saidshank, an auxiliary serrated shank mounted in said strap and carrying afixed jaw, a serrated member pivotally mounted within said strap, a pincarried by said member and protruding through said strap, a movable jawmounted upon said auxiliary shank, said movable jaw being formed with adepending' lug adapted to rest in the' bifurcated upper end of the mainshank, said main shank being provided with curved slots in its walls,anda pin passing through said slots and through the depending lug of themovable jaw.

Q. In a wrench of the character described, the combination with a mainshank having a handle, a rearwardly -projecting stirrup and curved slotsin the side walls of the stirrup, of a toothed auxiliary shank having afixed jaw, said auxiliary shank being slidably mounted in said stirrup,va toothed member pivotally mounted in said stirrup and having its innerand outer surfaces oppositely beveled, a pin carried by said member andprojecting through said stirrup, a spring carried by said stirrup andbearing on said member, a movable jaw mounted on said auxiliary shank,and having a lug on its lower end projecting through the Walls of thestirrup and a pin passing through the curved slot in the stirrup andpassing through said lug, said stirrup being formed with a curvedsurface adapted to bear against the lower edge of the movable jaw andvmove the latter on the auxiliary shank w hen the main shank is moved toan angular position with relation to the auxiliary shank.

In testimony whereof I affix my signature in the presence of twowitnesses. Y

' WILLIAM FRAZER.

Witnesses:

SAMUEL Gnovns, CALVIN JOHNS.

